I have found a couple of Agfa Rondinax 35s on eBay completed items. The photographs are on the Pinterest site – the link is shown at the top of this page.
To recap: First came the Agfa Rondinax 35. Then the Leitz-badged Rondinax 35; then the Agfa Rondinax 35U (these have the knob at the upper left-hand corner to open Leica B and other labyrynthine cassettes). The Essex 35 is a near clone of the Agfa Rondinax 35.